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The top layer of soil that has most nutrients and humus, most fully evolved layer dark in color and has minerals grains, decaying leaves, roots, insects, and worms.
The layer of soil that is often called subsoil that usually consists of clay and other particles.
Plowing furrows sideways across a hillside to help prevent formation of rills and guillies.
Process of changing what is planted in a field from year to year in order to restore soil nutrients.
The process by which formerly fertile lands become increasingly arid, unproductive, and desert-like.
Term used to describe the central and southern Great Plains in the 1930s when the region sustained a period of drought and dust storms.
Very little humus. Minerals leached from rainwater and minerals already in the soil that resist leaching. Below A above B.
The removal of soluble substances from rock, ore, or layers of soil due to the passing of water.
No Till Agriculture
The process of not plowing land and using herbicides to prevent some types of weeds from surfacing.
When small traces of salt in freshwater irrigation builds up in arid climates, rendering the land worthless.
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